This is an example of BLE GATT Client, which receives broadcast data from BLE_Server_BME280 ( a GATT server) , then transfers values up to mbed Device Connector (cloud).

Please refer details about BLEClient_mbedDevConn below. https://github.com/soramame21/BLEClient_mbedDevConn

The location of required BLE GATT server, BLE_Server_BME280, is at here. https://developer.mbed.org/users/edamame22/code/BLE_Server_BME280/

Revision:
0:29983394c6b6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pal/Test/Unitest/pal_socket_test.c	Thu Apr 13 04:48:11 2017 +0000
@@ -0,0 +1,428 @@
+/*
+* Copyright (c) 2016 ARM Limited. All rights reserved.
+* SPDX-License-Identifier: Apache-2.0
+* Licensed under the Apache License, Version 2.0 (the License); you may
+* not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an AS IS BASIS, WITHOUT
+* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+#include "pal.h"
+#include "pal_network.h"
+#include "pal_plat_network.h"
+#include "unity.h"
+#include "unity_fixture.h"
+#include "pal_test_utils.h"
+#include "pal_socket_test_utils.h"
+#include "string.h"
+
+
+
+TEST_GROUP(pal_socket);
+
+//sometimes you may want to get at local data in a module.
+//for example: If you plan to pass by reference, this could be useful
+//however, it should often be avoided
+//extern int Counter;
+
+#define PAL_NET_SUPPORT_LWIP 1
+#define PAL_NET_TEST_SERVER_NAME "e109180-lin.kfn.arm.com"
+#define PAL_NET_TEST_SERVER_IP   {10,45,48,190}
+#define PAL_NET_TEST_SERVER_IP_STRING   "10.45.48.190"
+#define PAL_NET_TEST_SERVER_HTTP_PORT 8686
+#define PAL_NET_TEST_SERVER_UDP_PORT 8383
+#define PAL_NET_TEST_INCOMING_PORT 8000
+
+void * g_networkInterface = NULL;
+
+
+static uint32_t s_callbackcounter = 0;
+
+void socketCallback()
+{
+    s_callbackcounter++;
+}
+
+TEST_SETUP(pal_socket)
+{
+    uint32_t index = 0;
+    palStatus_t status = PAL_SUCCESS;
+    static void * interfaceCTX = NULL;
+    //This is run before EACH TEST
+    if (!interfaceCTX)
+    {
+        status = pal_init();
+        if (PAL_SUCCESS == status)
+        {
+            interfaceCTX = palTestGetNetWorkInterfaceContext();
+            pal_registerNetworkInterface(interfaceCTX , &index);
+            g_networkInterface = interfaceCTX;
+        }
+    }
+}
+
+TEST_TEAR_DOWN(pal_socket)
+{
+}
+
+#define PAL_TEST_BUFFER_SIZE 50
+
+TEST(pal_socket, socketUDPCreationOptionsTest)
+{
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocket_t sock2 = 0;
+    palSocket_t sock3 = 0;
+    palSocket_t sock5 = 0;
+    uint32_t numInterface = 0;
+    palNetInterfaceInfo_t interfaceInfo;
+    uint32_t interfaceIndex = 0;
+    uint32_t sockOptVal = 5000;
+    uint32_t sockOptLen = sizeof(sockOptVal);
+
+    TEST_PRINTF("start socket test\r\n");
+
+    memset(&interfaceInfo,0,sizeof(interfaceInfo));
+    // check that re-addignt he network interface returns the same index
+    pal_registerNetworkInterface(g_networkInterface, &interfaceIndex);
+    TEST_ASSERT_EQUAL(interfaceIndex, 0);
+    pal_registerNetworkInterface(g_networkInterface, &interfaceIndex);
+    TEST_ASSERT_EQUAL(interfaceIndex, 0);
+
+    TEST_PRINTF("create sockets\r\n");
+
+
+    //blocking
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_DGRAM, false, interfaceIndex, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_DGRAM, false, interfaceIndex, &sock2);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    //non-blocking
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_DGRAM, true, interfaceIndex, &sock5);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_asynchronousSocket(PAL_AF_INET, PAL_SOCK_STREAM, false, interfaceIndex, socketCallback, &sock3);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+
+    result = pal_getNumberOfNetInterfaces(&numInterface);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(numInterface, 1);
+
+    result = pal_getNetInterfaceInfo(0, &interfaceInfo);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF("interface addr: %d %d %d %d \r\n", interfaceInfo.address.addressData[2], interfaceInfo.address.addressData[3], interfaceInfo.address.addressData[4], interfaceInfo.address.addressData[5]);
+
+    
+    result = pal_setSocketOptions(sock, PAL_SO_RCVTIMEO, &sockOptVal, sockOptLen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS); 
+
+    TEST_PRINTF("close sockets\r\n");
+    
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_close(&sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_close(&sock2);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_close(&sock5);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_close(&sock3);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    TEST_PRINTF("end\r\n");
+ 
+}
+
+
+TEST(pal_socket, basicTCPclinetSendRecieve)
+{
+
+
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocketAddress_t address = { 0 };
+    const char* message = "GET / HTTP/1.0\r\n\r\n";
+    size_t sent = 0;
+    char buffer[100] = { 0 };
+    size_t read = 0;
+    palSocketLength_t addrlen = 0;
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_getAddressInfo(PAL_NET_TEST_SERVER_NAME, &address, &addrlen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_setSockAddrPort(&address, PAL_NET_TEST_SERVER_HTTP_PORT);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_connect(sock, &address, 16);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    
+    result = pal_send(sock, message, 45, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_recv(sock, buffer, 99, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF(buffer);
+
+    TEST_ASSERT(read >= 4);
+    TEST_ASSERT(buffer[0] == 'H' && buffer[1] == 'T'&& buffer[2] == 'T' && buffer[3] == 'P');
+    pal_close(&sock);
+
+    TEST_PRINTF("test Done");
+
+}
+
+TEST(pal_socket, basicUDPclinetSendRecieve)
+{
+
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocketAddress_t address = { 0 };
+    palSocketAddress_t address2 = { 0 };
+    uint8_t buffer[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };
+    size_t sent = 0;
+    size_t read = 0;
+    palSocketLength_t addrlen = 0;
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_DGRAM, false, 0, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_getAddressInfo(PAL_NET_TEST_SERVER_NAME, &address, &addrlen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    result = pal_setSockAddrPort(&address, PAL_NET_TEST_SERVER_UDP_PORT);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    TEST_PRINTF("udp send \r\n");
+    result = pal_sendTo(sock, buffer, 10, &address, 16, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(sent, 10);
+    result = pal_plat_receiveFrom(sock, buffer, 10, &address2, &addrlen, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(read, 10);
+    TEST_PRINTF("udp done \r\n");
+    pal_close(&sock);
+}
+
+
+TEST(pal_socket, basicSocketScenario3)
+{
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocketAddress_t address = { 0 };
+    const char* message = "GET / HTTP/1.0\r\nHost:10.45.48.68:8000\r\n\r\n";
+    size_t sent = 0;
+    char buffer[100] = { 0 };
+    size_t read = 0;
+    s_callbackcounter = 0;
+    palSocketLength_t addrlen = 0;
+
+    result = pal_asynchronousSocket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, socketCallback, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_getAddressInfo(PAL_NET_TEST_SERVER_NAME, &address, &addrlen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_setSockAddrPort(&address, PAL_NET_TEST_SERVER_HTTP_PORT);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_connect(sock, &address, 16);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_send(sock, message, 45, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_recv(sock, buffer, 99, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF(buffer);
+
+    TEST_ASSERT(read >= 4);
+    TEST_ASSERT(buffer[0] == 'H' && buffer[1] == 'T'&& buffer[2] == 'T' && buffer[3] == 'P');
+    TEST_ASSERT(s_callbackcounter > 0);
+    TEST_PRINTF("callback counter %d \r\n", s_callbackcounter);
+    pal_close(&sock);
+
+    TEST_PRINTF("test Done");
+}
+
+TEST(pal_socket, basicSocketScenario4)
+{
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocket_t sock2 = 0;
+    palSocketAddress_t address = { 0 };
+    const char* message = "GET / HTTP/1.0\r\n\r\n";
+    size_t sent = 0;
+    char buffer[100] = { 0 };
+    size_t read = 0;
+    palSocketLength_t addlen = 0;
+    uint32_t numSockets = 0;
+    palSocket_t socketsToCheck[PAL_NET_SOCKET_SELECT_MAX_SOCKETS] = { 0 };
+    pal_timeVal_t tv = {0};
+    uint8_t palSocketStatus[PAL_NET_SOCKET_SELECT_MAX_SOCKETS] = { 0 };
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, &sock2);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_getAddressInfo("www.w3.org", &address, &addlen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF("addr lookup: %d %d %d %d \r\n", address.addressData[2], address.addressData[3], address.addressData[4], address.addressData[5]);
+
+    result = pal_setSockAddrPort(&address, 80);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_connect(sock, &address, 16);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_send(sock, message, 45, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    socketsToCheck[0] = sock;
+    socketsToCheck[1] = sock2;
+    tv.pal_tv_sec = 5;
+    tv.pal_tv_usec = 1000;
+    
+    result = pal_plat_socketMiniSelect(socketsToCheck, 2, &tv, palSocketStatus, &numSockets);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    //TEST_ASSERT_EQUAL(numSockets, 1);
+    //TEST_ASSERT(palSocketStatus[0] >= 0);
+    
+    result = pal_recv(sock, buffer, 99, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF(buffer);
+
+    TEST_ASSERT(read >= 4);
+    TEST_ASSERT(buffer[0] == 'H' && buffer[1] == 'T'&& buffer[2] == 'T' && buffer[3] == 'P');
+
+    socketsToCheck[0] = sock2;
+    socketsToCheck[1] = 0;
+    tv.pal_tv_sec = 0;
+    tv.pal_tv_usec = 20000;
+    result = pal_plat_socketMiniSelect(socketsToCheck, 1, &tv, palSocketStatus, &numSockets);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(numSockets, 0);
+    TEST_ASSERT(palSocketStatus[0] == 0);
+    
+    pal_close(&sock);
+    pal_close(&sock2);
+
+    TEST_PRINTF("test Done");
+
+}
+
+TEST(pal_socket, basicSocketScenario5)
+{
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocket_t sock2 = 0;
+    palSocket_t sock3 = 0;
+
+    palSocketAddress_t address2 = { 0 };
+
+    char buffer[100] = { 0 };
+    const char* messageOut = "HTTP/1.0 200 OK";
+    size_t sent = 0;
+    size_t read = 0;
+    palSocketLength_t addrlen = 16;
+    palNetInterfaceInfo_t interfaceInfo;
+
+    memset(&interfaceInfo,0,sizeof(interfaceInfo));
+
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM_SERVER, false, 0, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, &sock2);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    
+    result = pal_getNetInterfaceInfo(0, &interfaceInfo);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_setSockAddrPort(&(interfaceInfo.address), PAL_NET_TEST_INCOMING_PORT);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    
+    result = pal_bind(sock, &(interfaceInfo.address), interfaceInfo.addressSize);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_listen(sock, 10);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    TEST_PRINTF("waiting for connection:\r\n");
+    result = pal_accept(sock, &address2, &addrlen, &sock2);
+    TEST_PRINTF("after accept:\r\n");
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+
+    result = pal_recv(sock2, buffer, 99, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_PRINTF(buffer);
+
+    result = pal_send(sock2, messageOut, 15, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_STREAM, false, 0, &sock3);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+
+
+    pal_close(&sock2);
+    pal_close(&sock3);
+    pal_close(&sock);
+    
+    TEST_PRINTF("test Done");
+}
+
+
+TEST(pal_socket, tProvUDPTest)
+{
+
+    palStatus_t result = PAL_SUCCESS;
+    palSocket_t sock = 0;
+    palSocketAddress_t address = { 0 };
+    palSocketAddress_t address2 = { 0 };
+    char buffer[100] = { 0 };
+    const char* messageOut = "HTTP/1.0 200 OK";
+    size_t sent = 0;
+    size_t read = 0;
+    palSocketLength_t addrlen = 16;
+    palSocketLength_t addrlen2 = 16;
+    int timeout = 10000;
+    result = pal_socket(PAL_AF_INET, PAL_SOCK_DGRAM, false, 0, &sock);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_getAddressInfo(PAL_NET_TEST_SERVER_IP_STRING, &address, &addrlen);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_setSockAddrPort(&address, PAL_NET_TEST_SERVER_UDP_PORT);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_setSocketOptions(sock, PAL_SO_SNDTIMEO, &timeout, sizeof(timeout));
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_sendTo(sock, messageOut, 16, &address, addrlen, &sent);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(sent, 16);
+
+    result = pal_receiveFrom(sock, buffer, 100, NULL, NULL, &read);
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+    TEST_ASSERT_EQUAL(read, 16);
+
+    timeout = 1;
+    result = pal_setSocketOptions(sock, PAL_SO_RCVTIMEO, &timeout, sizeof(timeout));
+    TEST_ASSERT_EQUAL(result, PAL_SUCCESS);
+
+    result = pal_receiveFrom(sock, buffer, 100, &address2, &addrlen2, &read); //  should get timeout
+    TEST_ASSERT_EQUAL(result, PAL_ERR_SOCKET_WOULD_BLOCK);
+}